$FE07/65031: Get I/O Status Word
Jump from $FFB7:
FE07: A5 BA LDA $BA ; Current File - First Address (Device number)
FE09: C9 02 CMP #$02
FE0B: D0 0D BNE $FE1A ; Control OS Messages
FE0D: AD 97 02 LDA $0297 ; RS232 Pseudo 6551 Status Register Image
FE10: 48 PHA
FE11: A9 00 LDA #$00
FE13: 8D 97 02 STA $0297 ; RS232 Pseudo 6551 Status Register Image
FE16: 68 PLA
FE17: 60 RTS
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